the whole picture, turn to us.attycointegratedsecurity, weconsider ourselves business optihow?rs. by building custom security solutions that integrate video, access control, fire and intrusion protection. all backed up with world-class monitoring centers, thousands of qualified technicians, and a personal passion to help protect your business. when your business is optimized like that, there's no stopping you. we are tyco integrated security. and we are sharper. >>> happening now, we're following breaking news. an alleged al qaeda-supported plot targeting a passenger plane thwarted. details on the arrests that have just been answer announced. >>> also, boston bombing suspect tamerlan tsarnaev's reported outburst at a cambridge, massachusetts, mosque. what set him off. >>> and was it a sign that he was turning radical? and is there a connection between one of the alleged bombers and militants in his native russia? cnn is on the ground there. we're looking for answers. i'm wolf blitzer. this is a special edition of "the situation room." >> announcer: this is cnn breaking news